Valve



P. Wl KNAUF Sept. 29, 1931.

VALVE Filed Jan. y10, 1930 ATTO/P/VEK Patented Sept. 29, 1931UNITEDTSTTATES rAULYW. KNAUF, or cYnwYn. rENnsfrnvANrA, nssrGNoR Tosentirmi: hun xoERrrNo t.. COMPANY, or Pinamar:prima, PENNSYLVANIA.;CORPORATION 'oFrnNNsYL- Valium.Y s.

Application' mea January 1o, 193e. semrm. 419,790.

My invention relates to valves of the type which perhaps may becharacterized as vheavy duty valves. In valves of this characterv it isthe usual practice to employ pilot valves in 5 association-with the mainvalves to facilitate the opening'of the latter from closed positlon.

In the use of -valve structures embodying main and pilot valves itisnecessary'that the' latter have a certain amount 'offplay' and itl 10frequently happens that theV main valvesl chatterwwhen close to theirseats vduring y1f; vide a construction having ymeans wherebychatteringor vibrating movements of the main valve relative to the pilot valveshall be prevented.

` l VIt also is an object of my invention lto pro-- '20 vide aconstruction wherein the pressure'ezz-l erted by the steam withinthevalve struc# ture tending to cause longitudinal movementl of the mainvalve withy reference to the ypilotl valve, to which the said main valveislcon' nected in one direction is counterbalanced' by an equalpressureV in the opposite ldirection whereby the pilot is heldopen'untilseated by final downward movementapplied* to f its stem.

Without further amplification or statement of the objects of theinvention -I shall now proceed with "Y the detailed Adescription thereofwherein additional objectsiand ad-I vantages will be pointed out or'elsewill be come apparent. In order that the invention may -be readilyunderstood and its practical advantages fully appreciated referencelshould be' had to the accompanying drawing wherein' I have illustrateda longitudinal sectional yview of1 a valve construction provided withthe novel means of my invention.

In the drawing I have shown at `1 a valve casing comprising an inlet 2and an' outlet`3, the inlet and outlet being oifset withrelation to eachother as shown. The inlet hasconnection with an upper chamber ofthe'valve casing while the outlet has connection with a lower chamber, thetwo chambers -being separated by a partition wall 4 having anopenpresence of the packing surrounding the tail oFEI'c-E? ing k:5therethrough which lis adapted to be opened and'closed byv means of avalve 6. The upper side' of the partition wall'4 is'provided withansrannular member 7 the upper-'inner edge of which constitutes 'theseat 8 for the-5"5` saidvalve. The upperchamberof the valve casing isclosed by means of a cover or closing plate 10, the said cover plateskbeing secured to thejlopenupper edge .of the casing 1 by A means offastening bolts 11. These bolts 1v1 de" also operateto fasten thetubular pedestaly 12in place upon ythe'casing, the said pedestalv beingprovided with aflange or foot portion 13 for that purpose. Suchk flangeorfoot portion rests upon the upper side of the outer 665i edge portionof the cover plate 10.v f The bottom end o the lower'chamber of thecasing is closed by alcover 14 which is secured by means of fasteningbolts 15. Thelower part of the lower chamber ofthe casing is providedwith a cylinder 16 which. is secured and held in place by means ofthecover: plate 14 which contacts :with the lower end'of saidl cylinder.The 'said Acylinderis o en at both ends. The v n hollowspool or stem 1which projects down-v 75: wardly'Z from the valve orlongitudinallyofthe'valve casing is providedwithl a headj or piston F2Ovat its lower end :which fits. closely within the cylinder 16. fThe'sp'oolisprovided in the opening through thepis'ton at its lower c*end with'a'crosspiece21 to which-is secured a tail piece 22 whichyIprojects outwardly through an opening 23 providedin the cover plate 14and into a tubular extensiony 24 the inner end yof-whichV terminateswith a glandfportion 25 which engages and is adapted to hold a packing26 within a vchamber provided by a llangeportion 27 K which projectsfrom the outer side ofthe cover plate 14. The

rod or piece 22 is for the purpose of rendering the opening23'steam-tight. The -lower .end of` the tubular extension 24 is providedwith an openingfrom which any liquid which may collectgtherein mayescape. The presence of said opening also exposes the tail rodor piece22 to the' atmosphere.V .i

p YThe valve 6 Vis provided with an upwardly extending hollow projectingportion 30 the vupper endetV whichissli'ghtly enlargd'and l-100 f closedA by means of a'pilot valve 34 whichis connected with andconstitutes a head upon the inner lower end of the rod 35, the saidv rodconstituting a stem for *the said pilot valve.' For connecting thepilot`valve-34 and its stem1 35V with the valve G ,and its spool-17Ihave provided a disc :36` which 'is .secured'in the` upper end of thehollow portiorr() byY fasteningdevices indicated atf37;z The centralportion of the ydisc 36 is provided with anelongated hub 38 having a.central'yopening therethrough'through which the `rod or pilot valvestem35 extends. 'The lower or inner end of the `hub 38 -is located ashort distancefrom the upper or'jo'uterend ofv the pilot 'valve34 sothatthe'said pilot valve is permitted-toA move throughs-av shortdistanceI between lits seat upon the vtop4 of the valve 6 andthe innerzor lower end of the said hub. The said rod ori pilot valve sternl35 alsoextends through an 0pening140`in the cover plate 10.v .The outerY end ofsaid opening isienlargd'as indicated' and is surroundedby'atubular-flange" portion 41.- nThe space within the-enlarged porftion ofsaid opening surrunding-the rod 35 is filled with packing material' 42which is adapted tobe compressed and retained in position byaglandmember l43 which is held in position by' fasteningandtightening screwbolts 44".v `rPhe rodvor'stem `35'is movable through the1open`ing'40fandis provided; at a point withinthe pedestal l2 with a crossw'iseextending'inemherll whicheis-adapt'e'd to engageguides-46 in` opposedvrelation i tol each i otherupon'thefinnerside ofthe hollowypedestal'12.y The-upper'end portion'of the roeier stem o 35 isscrew-threaded as shown at r47 and is in engagement' with thescrew-threaded portion 48 at the upper end of an elongatednut 49 which-is adapted tobe rotated 'by means of Ta hand wheelfO. Rotation of thesaid nut maybe eiec'ted'by other. means which may bepower actuated.-.The lower Vendof the nutprojects through aliopeningxl provided inafplate 52 which closes*j the upper end of the" pedestal 12,'k the saidplate being secured to the' pedestal by?y fasteningvv screw bolts 53 Thenut 49-is provided .with-aflateral annular 'flange or projection-55intermediatev its' endsthe lower sideA of which rests upon Ytheupperus'ide ofV a ballbearing'assembly 57 which is supported upon theupper side of the coverfplat'e'atthe bottom of a chamber provided' bythe upwardly :extending tubular projection -585 -S'aid' projection isThev valve. is provided with a cent-ral. o ening'33'rwhichis ada'pte'dtobe opened and j meansof fastening screw bolts 64. The upper oryouterside ofthe ballbearing ring 6l is pr'actically*flush with'the`upper edge of the "tubular projectionA 58 i The diameters of therod or pilot valve stem A3`and the tail rod or piece 22 are the same orpractically so. Inmother words, their diameters should be y'as nearlythe same as is commercially'practical. a K

When it isdesired to open the valve 6 the hand Wheel l50er other meanswhich may be poweraetuated, -as previously stated, is rotated'to turnthe'nut 49 in `a direction to cause outward Imovement first-:of therod35 andthe pilot valve 34.4 connected *Kt-herewith. 'Opening; movementofthel pilot valve 34 is resisted by the pressure ofthe steam-,upon thearea ofthe outer side thereof which surrounds thestern;n The area oftheannular space upon the upper1 or( outer side of ltherpilotv valvewhich surrounds the rodor stem 35 is quitersmall as compared with theimilar area Vofthe valve 6. It ffollows, therefore, that whilearelatiyelysmall force only is necessaryatoi-imp'art initial openingmovement to the pilot valve 34 a relatively great or large force wouldbegrequired to impart initial movementg to `the-,valve 6. The pilotvalve.- having :been once opened, however, steamflows,through-Athe,'opening` 33V and through the tubular. valve spoolHand-thence to the under side .-offthe latter'and the head thereon.4VThesteam thus 'being present both abovevand below the-valvethe lattermay nowy bev moved-Tinta.,openfposition without the necessity of.overcoming any lpressure Ol force other than that due to gravity and tofrictionfhetween moving parts. i

j Heretofore Y there has been difficulty owing to the j-chattering ofthe main valve between its-seat 2and-the pilot vlave. By providing thetai-l piece-2,2 whi'ch5as well as the'rod 35, is exposed to theatmosphere vsuch chatteringuis prevented. 1' lThepressure exerted bythefsteamor other 'fluid pressure after itentjers the 'Spool'l7 throughthe opening 33 is exerted equally lagainst-theV rod 35 andthe tailrodorpiece 22.v EIt follows, therefore, that :when they-pilot valve andlmain valve are moving from an open position of the main valve (thepilot` valve being likewise open) the'said pilot and main valves movetogether withthepilot--valve remaining open' until the mainvalvej'oontacts, with -its' seat at 8 whereupon. the lpilotvalvecontinues-its move- Ament V.until it isseated1 upon fthe main valve.

This-iinalclosing movement ofthe pilot valve of the luid within thevilve casing against such movement is such that less effort is requiredto be applied to the wheel 50` (or otherA operating means) than isrequired to unseat the pilot valve when moving the same from closed toopen position.

Although performing no function insofar as the present invention isconcerned itmay be noted that I have provided a screen structure whichsurrounds the portion of the valve structure which is located in theinlet portion of the valve casing. i

Having thus described my invention, what I claim and desire to secure byLetters Patent is:

l. A valve structure of the character described comprising a valvecasing, a movable valve member located in said casing for closing anopening therethrough, said valve member having a hollow guiding stemyand also having an opening therethrough in communication with theopening-through the said guiding stem, a valve for closing said opening,said valve having a stem which is exposed to the atmosphere, and a tailrod having connection with the said hollow stem and being exposed to theatmosphere, the diameters of the said tail rod and the stem for thesecond named valve being approximately equal. Y

2. A valve structure ofthe character described comprising a valve casinghaving an opening therethrough, a'movable valve for opening and closingsaid-opening, said valve having a hollow stem projecting therefrom,

the opening through said stemvbeing in communication with the openingthrough the said guiding stem a pilot valve for closing the openingthrough said movable valve, said pilot valve having a stem exposed tothe atmosphere, means for limiting the movement of said pilot valve, anda tail rod connected to the hollow stem of the lirstfnamed valve andexposed to the atmosphere, the said tail rod and the said pilot' valvestem being of substantially-the same area in cross section.

phere and the cross sectional areas of the said tail rod and the saidpilot valve stem being approximately equal.

` 4. A valve structure of the character described comprising'a valvecasing having an opening therethrough, a movable valve member foropening and closing said opening, said valve member being provided witha downwardly extending hollow guiding stem, an upwardly extendingguiding portion and a relatively small opening therethrough incommunication with the opening through the said stem, a pilot valve foropening and closing said opening, said pilot valve having a stemextending upwardly in a direction opposite that of the said hollowguiding stem of the first named valve, means mounted upon the upwardlyextending portion of the said rst named valve for guiding the pilotvalve stem and for -limiting the movements of the said pilot valve,the'said pilot valve stem projecting from the said casing and beingexposed to the atmosphere, and a tail rod connected to and extendingfrom the lower end of the said hollow guiding stem of the firstnamedvalve and projecting from the said casing and being exposed to theatmosphere, the cross sectional areas of the said pilot-valve stem ,andthe said tail rod being approximately equal.

my invention I havey hereunto signed my name this 9th day of January, A.D., 1930. l

PAUL W. KNAUF.

3. A valve structure of the character de-k y scribed comprising a valvecasing having an opening therethrough, a movable valve member foropening and closing the said opening, said movable valve member having ahollow stem projecting therefrom and also having j a relatively smallopening located centrally thereof in communication ywith the openingthrough the said steam, a pilot valve forclosing said relatively smallopening, said pilot valve having a stem which projects therefrom andwhich is exposed to lthe atmosphere,

means `for guiding the movements of said stem, and a tail rod havingconnection with the said hollow stem of the irst named valve, the saidtail rod being exposed to the atmos- 95 1n testimony that I claim theforegoing as v

